From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0BC0C433F5 for ; Mon, 7 Mar 2022 07:48:37 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4C6858D0002; Mon, 7 Mar 2022 02:48:37 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 475D18D0001; Mon, 7 Mar 2022 02:48:37 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 38C088D0002; Mon, 7 Mar 2022 02:48:37 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0028.hostedemail.com [216.40.44.28]) by kanga.kvack.org (Postfix) with ESMTP id 2A6278D0001 for ; Mon, 7 Mar 2022 02:48:37 -0500 (EST) Received: from smtpin31.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id D18A8181FEBDD for ; Mon, 7 Mar 2022 07:48:36 +0000 (UTC) X-FDA: 79216813032.31.AAB4379 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf17.hostedemail.com (Postfix) with ESMTP id 28A444000B for ; Mon, 7 Mar 2022 07:48:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=u44gcPJxldLKcwFv2Kgs/qlvzNfA8B/3/pfeFxePDMc=; b=ka9PRijrZ3eRBw1yItomT14Sqq jmBORx4WCv4segJPEOqcAC3tqzYtvC+BUZU4+e3vHCXkSbArBKnX45ei5WNvlf36lcWjyUgzAE7OG 1oA20KbtigBeQELHwPKsjqg0DOYHqmH+C8bYJm1QGOnPjx44rkEdJgP72nidrDZW/i/nFGHYMk5sJ XS5iV8+/7Zp5yJKt3rpIucmjX76N4zA0MRmAt1xxlFlNsVXNgR3q/FjL5Vu+0O5asOVkTIwmnnVbT zBu2SjEeBZ2Q6NXtgxS2ilZzHIYsyxgi3fxgw7eWR6CXDcPj2eTY9YRLOob0H05nk494vP2VOmvp4 TM7swpKg==; Received: from hch by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1nR86U-00GK0Y-TY; Mon, 07 Mar 2022 07:48:26 +0000 Date: Sun, 6 Mar 2022 23:48:26 -0800 From: Christoph Hellwig To: Matthew Wilcox Cc: Jarkko Sakkinen , linux-mm@kvack.org, Dave Hansen , Nathaniel McCallum , Reinette Chatre , Andrew Morton , linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, Florian Fainelli , Thomas Bogendoerfer , Matthew Auld , Thomas =?iso-8859-1?Q?Hellstr=F6m?= , Daniel Vetter , Jason Ekstrand , Chris Wilson , Maarten Lankhorst , Greg Kroah-Hartman , Tvrtko Ursulin , Vasily Averin , Shakeel Butt , Michal Hocko , zhangyiru , Alexey Gladkov , Alexander Mikhalitsyn , linux-mips@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, codalist@coda.cs.cmu.edu, linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH RFC 0/3] MAP_POPULATE for device memory Message-ID: References: <20220306053211.135762-1-jarkko@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 28A444000B X-Stat-Signature: u7tap4xp86i37ynebf4ewbdeysn5dhyq Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=ka9PRijr; spf=none (imf17.hostedemail.com: domain of BATV+2f3b7bc2299b721f5e4c+6770+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+2f3b7bc2299b721f5e4c+6770+infradead.org+hch@bombadil.srs.infradead.org; dmarc=none X-HE-Tag: 1646639316-106847 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, Mar 06, 2022 at 11:33:02AM +0000, Matthew Wilcox wrote: > On Sun, Mar 06, 2022 at 07:32:04AM +0200, Jarkko Sakkinen wrote: > > For device memory (aka VM_IO | VM_PFNMAP) MAP_POPULATE does nothing. Allow > > to use that for initializing the device memory by providing a new callback > > f_ops->populate() for the purpose. > > As I said, NAK. Agreed. This is an amazingly bad interface.